Vacuum glazing and method for manufacturing the same

ABSTRACT

A vacuum glazing includes a vacuum layer formed between a first glazing and a second glazing, a spacer provided in the vacuum layer, a frame provided at edge portions of the first and second glazings, and a sealant interposed between the frame and surfaces of the first and second glazings to perform sealing of the vacuum layer. The insulating performance of the vacuum glazing is improved.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. application Ser. No. 16/860,726, filed on Apr. 28, 2020, which is a continuation of U.S. application Ser. No. 16/206,569, filed on Nov. 30, 2018, now U.S. Pat. No. 10,676,981, which claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2017-0163726, filed on Nov. 30, 2017. The disclosures of the prior applications are incorporated by reference in their entirety.

FIELD

The present disclosure relates to a vacuum glazing and a method for manufacturing the same.

BACKGROUND

Glass may be used for the door of a home appliance. For example, the glass may be used for the door of a refrigerator. If the glass is applied to the door of the refrigerator, a user has an advantage in that the user may easily see foods stored in the refrigerator through transparent glass without opening the door.

However, since the glass represents a lower insulating rate due to the intrinsic characteristic of the glass, chilly air stored in the refrigerator may be leaked to the outside through the glass. In particular, when the glass constitutes a glazing in a single layer, the lower insulating rate may be a more serious problem.

To compensate for the lower insulating rate, the glass may constitute a double glazing or a vacuum glazing including at least two glazings. The double glazing may be formed by injecting specific gas, which has a lower heat transfer coefficient, between the two glazings.

In addition, the vacuum glazing may be formed by making, in the vacuum state, the space between the two glazings. The vacuum glazing is more advantage than the double glazing in terms of an ability to block heat from being transferred to an inside or an outside of glass.

Regarding the vacuum glazing, there are introduced following related arts.

-   -   1. Korean Unexamined Patent Publication No. (publication date):         10-2009-0036709 (Apr. 15, 2009).     -   2. Title of disclosure: Vacuum window glass and method of         fabricating the same

The related art has the following problems.

First, as the thicker thickness of an adhesive (glass frit) for bonding the two glazings to each other is formed (to about 8 mm or more) to improve the adhesive force between two glazings, heat is transferred through the bonding part, thereby forming dew. In addition, an addition heater is required to prevent the dew from being produced.

Second, as the thicker vacuum layer is formed due to the thicker adhesive, the height of a spacer to support the two glazings between the two glazings is increased. Accordingly, the spacer may fall down or may not be stably installed in the manufacturing process of the vacuum glazing.

In addition, when the diameter of the spacer is increased to the above problem, the insulating performance of the vacuum glazing may be deteriorated.

SUMMARY

The present disclosure provides a vacuum glazing and a method for manufacturing the same, capable of improving insulating performance. In particular, the present disclosure provides a vacuum glazing capable of improving vacuum performance in an edge portion of a glazing.

In addition, the present disclosure provides a vacuum glazing and a method for manufacturing the same, capable of improving the bonding property and strength of a glazing by applying a metallic frame to a part (the bonding part) at which two glazings are bonded to each other.

Further, the present disclosure provides a vacuum glazing and a method for manufacturing the same, capable of lowering heat transfer at the bonding part by using a metallic frame having a lower heat transfer coefficient. In addition, the present disclosure provides a vacuum glazing, capable of reducing a heat transfer coefficient by suggesting the optimal shape of the frame and thus increasing the length of a heat transfer path.

Further, the present disclosure provides a vacuum glazing in which, as a metallic frame having a lower corrosion property is used, even if dew is produced at the bonding part, the metallic frame can be prevented from being corroded.

The present disclosure provides a vacuum glazing simply manufactured as a glazing is assembled with a frame having an adhesive. Further, the present disclosure provides a vacuum glazing and a method for manufacturing the same, in which a frame having an adhesive integrated thereto is mass-produced as separate component.

According to an aspect of the present disclosure, a vacuum glazing may include a vacuum layer formed between a first glazing and a second glazing, a spacer provided in the vacuum layer, a frame provided at edge portions of the first and second glazings, and a sealant interposed between the frame and surfaces of the first and second glazings to perform sealing of the vacuum layer. Accordingly, the insulating performance of the vacuum glazing may be improved.

The frame may include a metallic member, especially, a stainless material. Accordingly, the strength of the vacuum glazing may be improved, and the bonding property of the glazing may be improved.

The frame may be coupled to lateral side surfaces of the first and second glazings and may have a bent shape. Accordingly, the close contact property of the first and second glazings may be improved.

The frame may further include a third part coupling a first part to a second part and having a bent or a rounded shape. Accordingly, the frame may apply elasticity to the first and second glazings.

The first and second parts may be coupled to top and bottom surfaces of the first and second glazings, and the third part may be provided on lateral side surfaces of the first and second glazings. Accordingly, the bonding property between the first and second glazings may be improved.

A vacuum layer includes a frame insulating layer interposed between the lateral side surfaces of the first and second glazings and an inner surface of the third part.

Since the sealant is provided between the inner circumferential surface of the frame and the outer surfaces of the first and second glazings, the sealing effect of the vacuum glazing may be improved.

Since the sealant is provided between the frame and the top surface of the first glazing and between the frame and the bottom surface of the second glazing, the sealing effect of the vacuum glazing may be improved.

The first and second glazings may have a rectangular shape and the frame may include four frame parts corresponding to corners of the first and second glazings. Accordingly, the first and second glazings may be stably coupled to the frame.

Since the vertical width of the insulating layer is in the range of 0.18-0.22 mm, and the thickness of the frame is in the range of 0.2-1.0 mm, the insulating performance may be improved and the stiffness of the frame may be maintained.

Since each of parts of the first and second glazings, which are coupled to the frame, has a lateral-width (w) in a range of 3-10 mm, the sealant may be stably formed.

According to another aspect of the present disclosure, a method of a vacuum glazing includes installing a spacer on a top surface of a first glazing, covering a second glazing on the spacer, manufacturing a glazing assembly by coupling a frame including a metallic material to edge portions of the first glazing and the second glazing, sealing the first glazing and the second glazing and the frame by heating the glazing assembly, forming a vacuum layer in a space between the first glazing and the second glazing by performing pumping through an exhaust hole in the second glazing, and filling the exhaust hole with an exhaust finishing material.

As described above, according to the present disclosure, the frame and the adhesive may be assembled between the two glazings. Accordingly, the insulating performance of the vacuum glazing may be improved. In particular, the vacuum performance at the bonding part (the end portion) of the vacuum glazing, with which the frame is assembled, may be improved.

In addition, the frame may include the metallic material, so the bonding property of the glazing is improved. Accordingly, the strength in the bonding part may be improved.

In addition, the frame may include a stainless material having a lower heat transfer coefficient and a lower corrosion property. Accordingly, the vacuum glazing may be configured to represent the lower heat transfer at the bonding part and to represent a stronger property against moisture.

In addition, the frame is configured to surround the edge portions of the two glazings, so the length of the heat transfer path is increased through the frame. Accordingly, the heat transfer coefficient may be lowered at the bonding part.

In addition, the frame includes a plurality of parts which are bent or curved. Accordingly, the close contact property between two glazings may be improved.

Further, since the glazing may be assembled with the frame having the adhesive integrated thereto, the manufacturing method may be simplified and the frame may be mass produced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating the configuration of a vacuum glazing according to a first embodiment of the present disclosure;

FIG. 2 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the first embodiment of the present disclosure;

FIG. 3 is a sectional view taken along line I-I′ of FIG. 1 ;

FIG. 4 is a sectional view taken along line II-II′ of FIG. 1 ;

FIGS. 5A to 5F are views illustrating a method for manufacturing the vacuum glazing according to the first embodiment of the present disclosure;

FIG. 6 is a perspective view illustrating the configuration of the vacuum glazing according to a second embodiment of the present disclosure;

FIG. 7 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the second embodiment of the present disclosure;

FIG. 8 is a sectional view taken along line of FIG. 6 ;

FIGS. 9A to 9C are views illustrating a method for manufacturing the vacuum glazing according to the second embodiment of the present disclosure;

FIG. 10 is a perspective view illustrating the configuration of the vacuum glazing according to the third embodiment of the present disclosure;

FIG. 11 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the third embodiment of the present disclosure;

FIG. 12 is a sectional view taken along line IV-IV′ of FIG. 10 ;

FIGS. 13A to 13C are views illustrating a method for manufacturing the vacuum glazing according to the third embodiment of the present disclosure;

FIG. 14 is a perspective view illustrating the configuration of the vacuum glazing according to a fourth embodiment of the present disclosure;

FIG. 15 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the fourth embodiment of the present disclosure;

FIG. 16 is a sectional view taken along line V-V′ of FIG. 14 ;

FIGS. 17A to 17D are views illustrating a method for manufacturing the vacuum glazing according to the third embodiment of the present disclosure; and

FIG. 18 is an experimental graph illustrating the comparison between insulating loads measured depending on the thickness of the frame according to the present disclosure.

DETAILED DESCRIPTION

Hereinafter, the detailed embodiment of the present disclosure will be described. The spirit of the present disclosure is not limited to the above embodiments. Those skilled in the art understanding the spirit of the present disclosure may easily suggest another embodiment within the range of the same spirit.

First Embodiment

FIG. 1 is a perspective view illustrating the configuration of a vacuum glazing according to a first embodiment of the present disclosure, FIG. 2 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the first embodiment of the present disclosure, FIG. 3 is a sectional view taken along line I-I′ of FIG. 1 , and FIG. 4 is a sectional view taken along line II-II′ of FIG. 1 .

Referring to FIGS. 1 to 4 , a vacuum glazing 10 according to the first embodiment of the present disclosure may be used for a refrigerator door. A vacuum glazing 10 according to the second to fourth embodiment to be described below may be used for the refrigerator door.

The vacuum glazing 10 includes a plurality of glazings 110 and 120 and a frame 150 which is coupled to edge portions of the plurality of glazings 110 and 120 to seal the space between the plurality of glazings 110 and 120 such that the space between the plurality of glazings 110 and 120 is maintained in a vacuum state.

The plurality of glazings 110 and 120 include a first glazing 110 and a second glazing 120 provided at one side of the first glazing 110. Although the direction that the first and second glazings 110 and 120 are arranged may be varied depending on a viewing direction, the second glazing 120 may be provided above the first glazing 110 based on a drawing.

For example, when the vacuum glazing 10 is used for the refrigerator door, the second glazing 120 may be formed on the rear surface of the refrigerator door and the first glazing 110 may be formed on the front surface of the refrigerator.

The first glazing 110 and the second glazing 120 may be provided in the shape of a thin plate. For example, the thickness of the first glazing 110 or second glazing 120 may be formed in the range of 3.5-4.5 mm.

In addition, the first and second glazings 110 and 120 may have, for example, a rectangular shape. In addition, the first and second glazings 110 and 120 may be provided to have the same size or the same shape.

The frame 150 may seal the corners of the first and second glazings 110 and 120. In detail, the frame 150 includes a plurality of frame parts arranged along the edge portions of the first and second glazings 110 and 120. For example, the plurality of frame parts include four frame parts.

The four frame parts include a first frame part coupled to first corners of the first and second plate glazings 110 and 120, a second frame part coupled to second corners of the first and second plate glazings 110 and 120, a third frame part coupled to third corners of the first and second plate glazings 110 and 120, and a fourth frame part coupled to third corners of the first and second plate glazings 110 and 120

The first to fourth frame parts may have the same configuration and the same shape. The frame 150 may have the rectangular shape having an open inner portion depending on the arrangement of the first to fourth frame parts. In addition, coupling surfaces 155 may be formed on opposite side portions of each of the first frame part to the fourth frame part. The coupling surface 155 may be configured to extend while being inclined with respect to four corners of the first and second glazings 110 and 120.

The frame 150 includes a metallic member. For example, the metallic material may include a stainless material having a lower heat transfer coefficient. The stainless material has a characteristic representing excellent adhesion to a sealant 170 to be described.

As the frame 150 is formed of metal, the bonding property between the first and second glazings 110 and 120 and the frame 150 may be improved, and the strength may be improved between the first and second glazings 110 and 120, and the frame 150.

The first and second glazings 110 and 120 are spaced apart from each other in a vertical direction. A vacuum layer 180 may be formed in a space between the first and second glazings 110 and 120. In other words, the vacuum layer 180 may be formed between the top surface of the first glazing 110 and the bottom surface of the second glazing 120. The vertical width of the vacuum layer 180 may be formed in the range of about 0.18-0.22 mm, and the vacuum pressure of the vacuum layer 180 may be 10⁻³ Torr or less.

A spacer 130 may be interposed between the first and second glazings 110 and 120 to support the first and second glazings 110 and 120. The spacer 130 may be provided in the vacuum layer 180 and may have, for example, the substantially cylinder shape. The lower portion of the spacer 130 may be supported to the top surface of the first glazing 110, and the upper portion of the spacer 130 may support the bottom surface of the second glazing 120.

The spacer 130 may include a plurality of spacers 130. The diameter of the spacer 130 may be about 0.5 mm, and the distance between the plurality of spacers 130 may be about 25 mm.

An exhaust finishing member 140 is provided in the second glazing 120. Those skilled in the art understands that the exhaust finishing member 140 seals an exhaust hole 125 (see FIG. 5C) formed in the second glazing 120.

The exhaust hole 125 may be configured to exhaust gas present between the first and second glazings 110 and 120, such that the vacuum layer is formed between the first and second glazings 110 and 120. The exhaust hole 125 may be formed through the second glazing 120 in a vertical direction.

After the gas is exhausted through the exhaust hole 125, the exhaust finishing member 140 stops the exhaust hole 125. For example, the exhaust finishing member 140 may include glass frit having a lower melting point.

The vacuum glazing 10 may further include an exhaust cap 145 provided at an upper portion of the exhaust finishing member 140. The exhaust cap 145 may have a cap shape to cover the exhaust finishing member 140 and may include a metallic material. The exhaust cap 145 may prevent the external pressure of the vacuum glass 10 to be applied to the exhaust finishing member 140, thereby preventing the exhaust finishing member 140 from deviating from the exhaust hole 125 or preventing the exhaust finishing member 140 from being broken.

The vacuum glazing 10 further includes a gas adsorbent 160 (getter). Those skilled in the art may understand that the gas adsorbent 160 may include moisture or gas which may be generated in the procedure of manufacturing the vacuum glazing 10. In other words, even though the vacuum layer 180 is formed in the vacuum glazing 10, moisture or predetermined gas may be produced in the first and second glazings 110 and 120 or the spacer 130. The gas adsorbent 160 allows the gas to adsorb thereto, such that the vacuum layer 180 may be maintained in a vacuum state. For example, the gas adsorbent 160 may further include non-evaporable getter activated if current flows. After the vacuum glazing 10 is manufactured, power, which is supplied from the outside of the vacuum glazing 10, may be supplied to the gas adsorbent 160 through a wire.

The frame 150 may be coupled to the edge portions of the first and second glazings 110 and 120 such that the vacuum layer 10 may be easily maintained. In other words, the frame 150 may form an edge portion of the vacuum layer 180.

The four frame parts constituting the frame 150 include a first part 151, a second part 152, and a third part 153. The first part 151 and the second part 152 may be coupled to outer surfaces of the first and second glazings 110 and 120.

In detail, the first part 151 may have a bent shape and may be configured to be coupled between a bottom surface 111 and a first lateral side surface 113 of the first glazing 110. In addition, the second part 152 may have a bent shape and may be configured to be coupled to a top surface 121 and a second lateral side 123 of the second glazing 120.

The thickness of the frame 150, that is, the thickness (t) of the first to third parts 151, 152, and 153 may be formed in the range of 0.2-1.0 mm. If the thickness of the frame 150 is 0.2 mm or less, the frame 150 may be broken when the frame 150 is processed. In contrast, if the thickness ‘t’ of the frame 150 is 1.0 mm or more, the heat transfer coefficient of the frame 150 is increased, so that the insulating performance of the vacuum glazing 10 may be lowered.

The left-right width of the frame 150, that is, the width ‘w’ of the bottom surface 111 of the first glazing 110, which is coupled to the first part 151, may be formed in the range of 3-10 mm. The width ‘w’ may be equal to the width of the top surface part 121 of the second glazing 120, which is coupled to the second part 152.

If the width ‘w’ of the frame 150 is formed to be 3 mm or less, the sealant 170 is not compressed in the space between the frame 150 and the first and second glazings 110 and 120 by the sufficient length. Accordingly, the sealing effect may be degraded. In contrast, if the width ‘w’ of the frame 150 is formed to be 10 mm or more, since heat may be excessively lost in the edge portions of the first and second glazings 110 and 120, the insulation performance may be degraded.

A sealant 170 may be further included in the vacuum glazing 10. The sealant 170 may be provided in the coupling part between the first part 151 and the first glazing 110, and the coupling part between the second part 152 and the second glazing 120.

In detail, the sealant 170 may be interposed between the first part 151 and the bottom surface 111 and between the first part 151 and the first lateral side surface 113. In detail, the sealant 170 may be interposed between the second part 152 and the top surface 121 and between the second part 152 and the second lateral side portion 123.

The sealant 170 may be provided in the state that the sealant 170 is attached to the frame 150. For example, the sealant 170 may be coated on the frame 150 and may include glass frit. When the frame 150 is heated after the frame 150 is coupled to the first and second glazings 110 and 120, the sealant 170 is melted to be compressed between the frame 150 and the first and second glazings 110 and 120. Through the configuration of the sealant 170, the effect of sealing the coupling part of the frame 150 may be increased.

The third part 153 is connected with the first and second parts 151 and 152 and may be positioned at the side portions of the first and second glazings 110 and 120. The third part 153 may have a bent or rounded shape. For example, the third part 153 may have a hemispheric shape. The frame 150 may apply elasticity to the first and second glazings 110 and 120 due to the shape of the third part 153, such that the first and second glazings 110 and 120 may make close contact with the upper and lower portion of the frame 150.

A frame vacuum layer 182 is formed among the first and second glazings 110 and 120 and the inner part of the third part 153. The frame vacuum layer 182 may communicate with the vacuum layer 180, and thus the volume of a vacuum layer provided in the vacuum glazing 10 is enlarged. In a broad sense, those skilled art may understand that the frame vacuum layer 182 constitutes at least a portion of the vacuum layer 180.

The length of the frame 150 may be relatively increased due to the configuration of the first to third parts 151, 152, and 153. Accordingly, the length of a heat transfer path may be increased due to the frame 150 and thus an amount of transferred heat may be reduced.

FIGS. 5A to 5F are views illustrating a method for manufacturing the vacuum glazing according to the first embodiment of the present disclosure. Hereinafter, the method for manufacturing the vacuum glazing according to the first embodiment will be described with reference to FIGS. 5A to 5F.

First, the first glazing 110 is provided. The first glazing 110 may be provided after the first glazing 110 is cleaned (see FIG. 5A).

The spacer 130 may be provided on the top surface of the first glazing 110. The spacer 130 may include a plurality of spacers and the plurality of spacers may be provided at preset distances. For example, the plurality of spacers 130 may be arranged in the form of a lattice (matrix). The plurality of spacers 130 may protrude from the top surface of the first glazing 110 (see FIG. 5B).

The second glazing 120 may be covered on the first glazing 110. If the second glazing 120 is disposed, upper portions of the plurality of spacers 130 may support the bottom surface of the second glazing 120.

The exhaust hole 125 may be formed in the second glazing 120 such that an exhaust tube 128 is coupled to the exhaust hole 125. As described above, those skilled in the art may understand the exhaust hole 125 as a component to form vacuum layers 180 and 182 by exhausting gas present between the first and second glazings 110 and 120. In addition, the gas adsorbent 160 may be provided on the bottom surface of the second glazing 120 (FIG. 5C).

After the first and second glazings 110 and 120 are arranged, the frame 150 may be installed at edge portions of the first and second glazings 110 and 120. The frame 150 may have the sealant 170 coated on the inner surface of the frame 150.

In detail, four frame parts constituting the frame 150 may be arranged at respective edge portions of the first and second glazings 110 and 120 and coupled to outer surfaces of the first and second glazings 110 and 120. In this case, the coupling surface 155 provided on opposite side portions of each frame part may be coupled to coupling surfaces of two adjacent frame parts.

After the frame 150 is assembled with the first and second glazings 110 and 120, the assembly (hereinafter, a glazing assembly) between the first and second glazings 110 and 120 and the frame 150 is heated. In this heating procedure, the sealant 170 is melted and compressed to seal the space between the first and second glazings 110 and 120 and the frame 150 (see FIG. 5D).

Thereafter, the exhaust tube 128 is coupled to the exhaust hole 125, and vacuum-pumping is performed through the exhaust tube 128. Accordingly, the vacuum layer 180 and the frame vacuum layer 182 may be formed (see FIG. 5E). After the vacuum layers 180 and 182 are formed, the exhaust hole 125 may be clogged by the exhaust finishing member 140, and an exhaust cap 145 may be coupled to an outer portion of the exhaust finishing member 140 (see FIG. 5F). The vacuum-pumping process and the process of coupling the exhaust finishing member 140 to the exhaust cap 145 may be performed in a vacuum chamber having a vacuum atmosphere. Through the manufacturing method, the vacuum glazing 10 may be easily manufactured.

Hereinafter, second to fourth embodiments of the present disclosure will be described. The above embodiments are different from the first embodiment in the configuration of the frame. Accordingly, the following description will be made while focusing on the difference, and the description of the same part as that of the first embodiment will be understood by citing the description of the first embodiment. In addition, the same part will be assigned with reference numerals of the first embodiment.

FIG. 6 is a perspective view illustrating the configuration of the vacuum glazing according to a second embodiment of the present disclosure, FIG. 7 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the second embodiment of the present disclosure, FIG. 8 is a sectional view taken along line of FIG. 6 , and FIGS. 9A to 9C are views illustrating a method for manufacturing the vacuum glazing according to the second embodiment of the present disclosure.

Referring to FIGS. 6 to 9C, according to the second embodiment of the present disclosure, a vacuum glazing 10 a including a plurality of glazings 110 and 120 and a frame 150 which is coupled to edge portions of the plurality of glazings 110 and 120 to seal the space between the plurality of glazings 110 and 120 such that the space between the plurality of glazings 110 and 120 is maintained in a vacuum state.

The plurality of glazings 110 and 120 include a first glazing 110 and a second glazing 120. The description of the first and second glazings 110 and 120 will be understood by citing those of the first embodiment.

The frame 150 a may be configured to seal corners of the first and second glazings 110 and 120. In detail, the frame 150 a may include a plurality of frame parts arranged along the edge portions of the first and second glazings 110 and 120. For example, the plurality of frame parts include four frame parts.

The four frame parts include a first frame part coupled to first corners of the first and second plate glazings 110 and 120, a second frame part coupled to second corners of the first and second plate glazings 110 and 120, a third frame part coupled to third corners of the first and second plate glazings 110 and 120, and a fourth frame part coupled to fourth corners of the first and second plate glazings 110 and 120

The first to fourth frame parts may have the same configuration and the same shape. The frame 150 a may have the rectangular shape having an open inner portion depending on the arrangement of the first to fourth frame parts. In addition, coupling surfaces 155 a may be formed on opposite side portions of each of the first frame part to the fourth frame part and coupled two adjacent frame parts. The coupling surface 155 a may be configured to extend while being inclined with respect to four edges of the first and second glazings 110 and 120.

The frame 150 a may include a metallic material, for example, a stainless material. The details thereof will be understood by citing the description of the first embodiment.

The first and second glazings 110 and 120 are spaced apart from each other in a vertical direction, and a vacuum layer 180 a may be formed in a space between the first and second glazings 110 and 120.

In addition, a spacer 130 may be interposed between the first and second glazings 110 and 120 to support the first and second glazings 110 and 120. The spacer 130 may be provided in the vacuum layer 180. The details of the spacer 130 may be understood by citing the description of the first embodiment.

The vacuum glazing 10 a further includes an exhaust finishing member 140, an exhaust cap 145, and a gas adsorbent 160 provided on the second glazing 120. The details thereof may be understood by citing the description of the first embodiment.

The frame 150 a may be coupled to edges of the first and second glazings 110 and 120 such that the vacuum layer 180 may be maintained in a vacuum state. In other words, the frame 150 a may constitute the end portion of the vacuum layer 180 a.

The plurality of frame parts constituting the frame 150 a include a first part 151 a, a second part 152 a, and a third part 153 a. The first part 151 a, the second part 152 a, and the third part 153 a may be coupled to outer surfaces of the first and second glazings 110 and 120 and may have a linear plane shape. The frame 150 a may have a bending shape of “E” through the configuration of the first to third parts 151 a, 152 a, and 153 a.

In detail, the first part 151 a may be configured to be coupled to a bottom surface 111 of the first glazing 110. In detail, the second part 152 a may be configured to be coupled to a top surface 121 of the first glazing 120. In addition, the third part 153 a may be configured to be coupled a first lateral side surface 113 of the first glazing 110 and a second lateral side surface 123 of the second glazing 120.

The thickness ‘t1’ of the frame 150 a, that is, the thickness ‘t1’ of each of the first to third parts 151 a, 152 a, and 153 a may be in the range of 0.2-1.0 mm. If the thickness ‘t1’ of the frame 150 a is formed to be 0.2 mm or less, the frame 150 a may be broken when the frame 150 a is processed. In contrast, if the thickness ‘t1’ of the frame 150 may be configured to be 1.0 mm or more, the heat transfer coefficient of the frame 150 may be increased, so the insulating performance of the vacuum glazing 10 may be lowered.

The left-right width of the frame 150 a, that is, the width 41′ the bottom surface 111 of the first glazing 110, which is coupled to the first part 151 a, may be formed in the range of 3-10 mm. The width ‘w1’ may be equal to the width of the top surface part 121 of the second glazing 120, which is coupled to the second part 152 a.

If the width ‘w’ of the frame 150 a is formed to be 3 mm or less, the sealant 170 a is not compressed in the space between the frame 150 a and the first and second glazings 110 and 120 by the sufficient length. Accordingly, the sealing effect may be degraded. In contrast, if the width ‘w1’ of the frame 150 a is formed to be 10 mm or more, since heat may be excessively lost in the edge portions of the first and second glazings 110 and 120, the insulation performance may be degraded.

The sealant 170 a may be further included in the vacuum glazing 10 a. The sealant 170 a may be interposed between inner surfaces of the first to third parts 151 a, 152 a, and 153 a and outer surfaces of the first and second glazings 110 and 120.

In detail, the sealant 170 a may be interposed between the first part 151 a and the bottom surface 111 of the first glazing 110. In detail, the sealant 170 a may be interposed between the first part 152 a and the top surface 121 of the second glazing 120. In detail, the sealant 170 a may be interposed between the third part 153 a, and the first lateral side surface 113 and the second lateral side surface 123.

The configuration of the sealant 170 a and the concept that the frame 150 a having the sealant 170 a is provided will be understood by citing the description of the first embodiment.

The length of the frame 150 a may be relatively increased due to the configuration of the first to third parts 151 a, 152 a, and 153 a. Accordingly, the length of a heat transfer path may be increased due to the frame 150 a and thus an amount of transferred heat may be reduced.

Hereinafter, the method for manufacturing the vacuum glazing according to the second embodiment will be described with reference to FIGS. 9A to 9C. The description of the manufacturing method made with reference to FIGS. 5A to 5C of the description according to the first embodiment will be cited.

As shown in FIGS. 5A to 5C, a plurality of spacers 130 are installed on the first glazing 110 and the second glazing 120 is covered. Then, the frame 150 a may be installed at the edge portions of the first and second glazings 110 and 120. The frame 150 a may have the sealant 170 a coated on the inner surface of the frame 150.

In detail, four frame parts constituting the frame 150 a may be arranged at respective edge portions of the first and second glazings 110 and 120 and coupled to outer surfaces of the first and second glazings 110 and 120. In this case, the coupling surface 155 a provided on opposite side portions of each frame part may be coupled to coupling surfaces of two adjacent frame parts.

After the frame 150 a is assembled with the first and second glazings 110 and 120, the assembly (hereinafter, a glazing assembly) between the first and second glazings 110 and 120 and the frame 150 a is heated. In this heating procedure, the sealant 170 a is melted and compressed to seal the space between the first and second glazings 110 and 120 and the frame 150 a (see FIG. 9A).

Thereafter, the exhaust tube 128 is coupled to the exhaust hole 125 formed in the second glazing 120, and vacuum-pumping is performed through the exhaust tube 128. Accordingly, the vacuum layer 180 a may be formed (see FIG. 9B).

After the vacuum layer 180 a is formed, the exhaust hole 125 is clogged by the exhaust finishing member 140, an exhaust cap 145 may be coupled to an outer portion of the exhaust finishing member 140 (see FIG. 9C). Through the manufacturing method, the vacuum glazing 10 a may be easily manufactured.

Third Embodiment

FIG. 10 is a perspective view illustrating the configuration of the vacuum glazing according to the third embodiment of the present disclosure, FIG. 11 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the third embodiment of the present disclosure, FIG. 12 is a sectional view taken along line IV-IV′ of FIG. 10 , and FIGS. 13A to 13C are views illustrating a method for manufacturing the vacuum glazing according to the third embodiment of the present disclosure.

Referring to FIGS. 10 to 13C, according to the third embodiment of the present disclosure, a vacuum glazing 10 b including a plurality of glazings 110 and 120 and a frame 150 b which is coupled to edge portions of the plurality of glazings 110 and 120 to seal the space between the plurality of glazings 110 and 120 such that the space between the plurality of glazings 110 and 120 is maintained in a vacuum state.

The plurality of glazings 110 and 120 include a first glazing 110 and a second glazing 120. The description of the first and second glazings 110 and 120 will be understood by citing those of the first embodiment.

The frame 150 b may be configured to seal corners of the first and second glazings 110 and 120. In detail, the frame 150 b may include a plurality of frame parts 151 b, 152 b, 153 b, and 154 b arranged along the edge portions of the first and second glazings 110 and 120.

For example, the plurality of frame parts include four frame parts. In detail, the four frame parts include a first frame part 151 b coupled to first corners of the first and second plate glazings 110 and 120, a second frame part 152 b coupled to second corners of the first and second plate glazings 110 and 120, a third frame part 153 b coupled to third corners of the first and second plate glazings 110 and 120, and a fourth frame part 154 b coupled to fourth comers of the first and second plate glazings 110 and 120

The plurality of frame parts 151 b, 152 b, 153 b, and 154 b may be linked to each other. In addition, one side portion of the first frame part 151 b may be separated from one side portion of the fourth frame part 151 d. The frame 150 b may have the shape bent several times.

The first frame part 151 b may be assembled with the fourth frame part 151 d after the frame 150 b is assembled with the first and second glazings 110 and 120.

The first to fourth frame parts 151 b, 152 b, 153 b, and 154 b may have the same configuration and the same shape. The frame 150 a may have a rectangular shape having an open inner portion depending on the arrangement of the first to fourth frame parts.

The frame 150 b may include a metallic material, for example, a stainless material. The details thereof will be understood by citing the description of the first embodiment.

The first and second glazings 110 and 120 are spaced apart from each other in a vertical direction, and a vacuum layer 180 b may be formed in a space between the first and second glazings 110 and 120.

In addition, a spacer 130 may be interposed between the first and second glazings 110 and 120 to support the first and second glazings 110 and 120. The spacer 130 may be interposed in the vacuum layer 180. The details of the spacer 130 may be understood by citing the description of the first embodiment.

The vacuum glazing 10 b further includes an exhaust finishing member 140, an exhaust cap 145, and a gas adsorbent 160 provided on the second glazing 120. The details thereof may be understood by citing the description of the first embodiment.

The frame 150 a may be coupled to edges of the first and second glazings 110 and 120 such that the vacuum layer 180 may be maintained in a vacuum state. In other words, the frame 150 a may constitute the edge portion of the vacuum layer 180 a.

The first to fourth frame parts 151 b, 152 b, 153 b, and 154 b may be configured to be coupled to the first lateral side surface 113 of the first glazing 110 and the second lateral side surface 123 of the second glazing 120.

The thickness ‘t2’ of the frame 150 b may be in the range of 0.2-1.0 mm. If the thickness ‘t2’ of the frame 150 b is formed to be 0.2 mm or less, the frame 150 b may be broken when the frame 150 b is processed. In contrast, if the thickness ‘t2’ of the frame 150 b may be configured to be 1.0 mm or more, the heat transfer coefficient of the frame 150 b may be increased so the insulating performance of the vacuum glazing 10 b may be lowered.

The sealant 170 b may be further included in the vacuum glazing 10 b. The sealant 170 b may be interposed between inner surfaces of the first to third parts 151 b, 152 b, 153 b, and 154 b and the outer surfaces of the first and second glazings 110 and 120.

In detail, the sealant 170 b may be interposed between the inner circumferential surfaces of the parts 151 b, 152 b, 153 b, and 154 b of the frame 150 and the first lateral side surface 113 of the first glazing 110. In detail, the sealant 170 b may be interposed between the inner circumferential surfaces of the parts 151 b, 152 b, 153 b, and 154 b of the frame 150 and the second lateral side surface 123 of the second glazing 120.

The configuration of the sealant 170 b and the concept that the frame 150 b having the sealant 170 b is provided will be understood by citing the description of the first embodiment.

According to the configuration of the first to fourth frame parts 151 b, 152 b, 153 b, and 154 b, since the frame 150 b is provided only the lateral side surfaces of the first and second glazings 110 and 120, the top surface and the bottom surface of the first and second glazings 110 and 120, that is, the front surface and the rear surface of the refrigerator door (when the top surface and the bottom surface of the first and second glazings 110 and 120 are used for the front surface and the rear surface of the refrigerator door) may have smooth surfaces. In addition, the interference with another component is not made and a beautiful outer appearance is obtained.

Hereinafter, the method for manufacturing the vacuum glazing according to the third embodiment will be described with reference to FIGS. 13A to 13C. The description of the manufacturing method made with reference to FIGS. 5A to 5C of the description according to the first embodiment will be cited in the present embodiment.

As shown in FIGS. 5A to 5C, a plurality of spacers 130 are installed on the first glazing 110 and the second glazing 120 is covered. Then, the frame 150 b may be installed at the edge portions of the first and second glazings 110 and 120. The frame 150 may have the sealant 170 b coated on the inner surface of the frame 150 b.

In detail, four frame parts 151 b, 152 b, 153 b, and 154 b constituting the frame 150 a may be arranged at respective edge portions of the first and second glazings 110 and 120 and coupled to outer surfaces of the first and second glazings 110 and 120.

After the frame 150 b is assembled with the first and second glazings 110 and 120, the assembly between the first and second glazings 110 and 120 and the frame 150 b is heated. In this heating procedure, the sealant 170 b is melted and compressed to seal the space between the first and second glazings 110 and 120 and the frame 150 b (see FIG. 13A).

Thereafter, the exhaust tube 125 is coupled to the exhaust hole 125 formed in the second glazing 120, and vacuum-pumping is performed through the exhaust tube 128. Accordingly, the vacuum layer 180 b may be formed (see FIG. 13B).

After the vacuum layer 180 b is formed, the exhaust hole 125 is clogged by the exhaust finishing member 140, an exhaust cap 145 may be coupled to an outer portion of the exhaust finishing member 140 (see FIG. 5F). Through the manufacturing method, the vacuum glazing 10 b may be easily manufactured.

Fourth Embodiment

FIG. 14 is a perspective view illustrating the configuration of the vacuum glazing according to a fourth embodiment of the present disclosure and FIG. 15 is an exploded perspective view illustrating the configuration of the vacuum glazing according to the fourth embodiment of the present disclosure. FIG. 16 is a sectional view taken along line V-V′ of FIG. 14 , and FIGS. 17A to 17D are views illustrating a method for manufacturing the vacuum glazing according to the third embodiment of the present disclosure.

Referring to FIGS. 14 to 17D, according to the fourth embodiment of the present disclosure, a vacuum glazing 10 c including a plurality of glazings 110 and 120 and a frame 150 c which is interposed between the plurality of glazings 110 and 120 to seal the space between the plurality of glazings 110 and 120 such that the space between the plurality of glazings 110 and 120 is maintained in a vacuum state.

The plurality of glazings 110 and 120 include the first glazing 110 and the second glazing 120. The description of the first and second glazings 110 and 120 will be understood by citing those of the first embodiment.

The frame 150 c is compressed between the first and second glazings 110 and 120 to seal the space between the first and second glazings 110 and 120. In detail, the frame 150 c includes a plurality of frame parts 151 c, 152 c, 153 c, and 154 c. The plurality of frame parts 151 c, 152 c, 153 c, and 154 c may be linked to each other. The frame 150 c may have the shape bent several times.

The first to fourth frame parts 151 c, 152 c, 153 c, and 154 c may have mutually different configurations and shapes. The frame 150 c may have the shape of a rectangular frame having an open inner portion depending on the arrangement of the first to fourth frame parts.

The frame 15 c may include a metallic material, for example, a stainless material. The details thereof will be understood by citing the description of the first embodiment.

The first and second glazings 110 and 120 are spaced apart from each other in a vertical direction, and a vacuum layer 180 c may be formed in a space between the first and second glazings 110 and 120.

In addition, a spacer 130 may be interposed between the first and second glazings 110 and 120 to support the first and second glazings 110 and 120. The spacer 130 may be interposed in the vacuum layer 180 c. The details of the spacer 130 may be understood by citing the description of the first embodiment.

The vacuum glazing 10 a further includes an exhaust finishing member 140, an exhaust cap 145, and a gas adsorbent 160 provided on the second glazing 120. The details thereof may be understood by citing the description of the first embodiment.

The frame 150 c may be coupled to edge portions of the first and second glazings 110 and 120 such that the vacuum layer 180 may be maintained in a vacuum state. In other words, the frame 150 c may constitute the edge portion of the vacuum layer 180 c.

The first to fourth frame parts 151 c, 152 c, 153 c, and 154 c may be configured to be coupled to the first lateral side surface 114 of the first glazing 110 and the second lateral side surface 124 of the second glazing 120.

The thickness ‘t3’ of the frame 150 c may be in the range of 0.1-1.0 mm. If the thickness of the frame 150 c is formed to be 0.1 mm or less, the vertical width of the vacuum layer 18 c is significantly reduced and thus the insulating performance is degraded. In contrast, if the thickness ‘t3’ of the frame 150 c may be configured to be 1.0 mm or more, the heat transfer coefficient of the frame 150 may be increased so the insulating performance of the vacuum glazing 10 may be lowered.

The left-right width of the frame 150 c, that is, the width ‘w3’ of a top surface 114 of the first glazing 110, which is coupled to the frame 150 c, may be formed in the range of 3-10 mm. The width 43′ may be the width of the bottom surface 124 of the second glazing 120 couple to the frame 150 c.

If the width ‘w’ of the frame 150 c is formed to be 3 mm or less, the sealant 170 c is not compressed in the space between the frame 150 c and the first and second glazings 110 and 120 by the sufficient length. Accordingly, the sealing effect may be degraded. In contrast, if the width 43′ of the frame 150 c is formed to be 10 mm or more, since heat may be excessively lost in the edges of the first and second glazings 110 and 120, the insulation performance may be degraded.

The sealant 170 c may be further included in the vacuum glazing 10 c. The sealant 170 c may be provided between bottom surfaces of the first to fourth frame parts 151 c, 152 c, 153 c, and 154 c and the top surface 114 of the first glazing 110, and may be provided between top surfaces of the first to fourth frame parts 151 c, 152 c, 153 c, and 154 c and the bottom surface 124 of the second glazing 120.

The configuration of the sealant 170 c and the concept that the frame 150 c having the sealant 170 c is provided will be understood by citing the description of the first embodiment.

According to the configuration of the first to fourth frame parts 151 c, 152 c, 153 c, and 154 c, since the frame 150 c may be interposed between the first and second glazings 110 and 120, the frame 150 c may not be exposed out of the first and second glazings 110 and 120. Accordingly, when the vacuum glazing 10 c is used for the refrigerator door, the front surface and the rear surface of the door may be smooth. In addition, the interface with another component may not be made and the beautiful outer appearance may be made.

Hereinafter, the method for manufacturing the vacuum glazing according to the fourth embodiment will be described with reference to FIGS. 17A to 17D. The description of the manufacturing method made with reference to FIGS. 5A and 5B of the description according to the first embodiment will be cited in the present embodiment.

As illustrated in FIGS. 5A and 5B, after a plurality of spacers 130 are installed on the first glazing 110, the frame 150 c may be installed on the edge of the top surface of the first glazing 110. The frame 150 c may have a sealant 170 c coated on the frame 150 c (see FIG. 17A).

The second glazing 120 may be covered on the frame 150 c (see FIG. 17B). After the frame 150 c is interposed between the first and second glazings 110 and 120, the assembly between the first and second glazings 110 and 120 and the frame 150 c is heated. In this heating procedure, the sealant 170 c is melted and compressed to seal the space between the first and second glazings 110 and 120 and the frame 150 c (see FIG. 13A).

Thereafter, the exhaust tube 128 is coupled to the exhaust hole 125 formed in the second glazing 120, and vacuum-pumping is performed through the exhaust tube 128. Accordingly, the vacuum layer 180 c may be formed (see FIG. 17C).

After the vacuum layer 180 c is formed, the exhaust hole 125 is clogged by the exhaust finishing member 140, an exhaust cap 145 may be coupled to an outer portion of the exhaust finishing member 140 (see FIG. 17D). Through the manufacturing method, the vacuum glazing 10 c may be easily manufactured.

FIG. 18 is an experimental graph illustrating the comparison between insulating loads measured depending on the thickness of the frame according to the present disclosure.

The insulating performance may be varied depending on the thickness of the frame according to the embodiment of the present disclosure. In the above description, it is suggested that the thicknesses of the frames 150, 150 a, and 150 b described in the first to third embodiments are in the range of 0.2-1.0 mm.

For example, FIG. 18 is a graph showing the comparison between the related art and the second embodiment of the present disclosure.

Referring to FIG. 18 , reference sign A on a horizontal axis represents that only the sealant is provided instead of the frame between the first and second glazings. A vertical axis represents an insulating load, that is, a heat transfer load value. Those skilled in the art may understand that an amount of transferred heat is increased if the insulating load is increased.

Reference signs B1 and B3 represent the thickness of the frame 150 a according to the second embodiment. In detail, reference sign B1 represents that the thickness t1 of the frame 150 a is 0.2 mm, reference signal B2 represents that the thickness t1 of the frame 150 a is 0.5 mm, and reference sign B3 represents that the thickness t1 of the frame 150 a is 1.0 mm.

As known in graph, both reference signs B1 and B3 may represent a less insulating load as compared with reference sign. In summary, according to the embodiment of the present disclosure, as compared to the related art, the insulting performance of the vacuum glazing may be improved. 

What is claimed is:
 1. A vacuum glazing comprising: a first glazing that has a first surface and a second surface, the second surface extending in a different direction from the first surface; a second glazing that is spaced apart from the first glazing, the second glazing having a third surface and a fourth surface, the fourth surface extending in a different direction from the third surface; a vacuum layer defined between the first glazing and the second glazing; a spacer located in the vacuum layer and configured to support the first glazing and the second glazing; a frame that is located at edge portions of the first glazing and the second glazing; and a sealant that is provided between the frame and at least one surface of the first glazing and between the frame and at least one surface of the second glazing, the sealant being configured to cover an edge gap between the first glazing and the second glazing and seal the vacuum layer, wherein the sealant includes a cover portion that blocks the edge gap and a plurality of extensions that extend from the cover portion toward the spacer, and wherein the plurality of extensions include a first extension that contacts the first surface and a second extension that contacts the third surface and that is separated from the first extension.
 2. The vacuum glazing of claim 1, wherein the first surface faces the third surface, and the vacuum layer is defined between the first surface and the third surface, and wherein the first extension is spaced apart from the second extension.
 3. The vacuum glazing of claim 2, wherein the cover portion includes a first cover portion provided between the frame and the second surface and a second cover portion provided between the frame and the fourth surface.
 4. The vacuum glazing of claim 1, wherein the sealant defines a boundary of the vacuum layer.
 5. A vacuum glazing comprising: a first glazing that has a first surface and a second surface, the second surface extending in a different direction from the first surface; a second glazing that is spaced apart from the first glazing, the second glazing having a third surface and a fourth surface, the fourth surface extending in a different direction from the third surface; a vacuum layer defined between the first glazing and the second glazing; a spacer located in the vacuum layer and configured to support the first glazing and the second glazing; a frame that is located at edge portions of the first glazing and the second glazing; and a sealant that is provided between the frame and at least one surface of the first glazing and between the frame and at least one surface of the second glazing, the sealant being configured to seal the vacuum layer, wherein the sealant includes a first portion provided between the frame and the first surface and a second portion that extends toward an outside of the frame from the first portion, and wherein the second portion contacts the first surface and an end of the frame.
 6. The vacuum glazing of claim 5, wherein the sealant is filled completely in a first gap between the frame and the second surface of the first glazing such that no vacant space devoid of the sealant remains in the first gap, and wherein the sealant is further filled completely in a second gap between the frame and the fourth surface of the second glazing such that no vacant space devoid of the sealant remains in the second gap.
 7. The vacuum glazing of claim 5, wherein the frame comprises: a first frame that faces at least one of the first surface or the second surface of the first glazing; and a second frame that faces at least one of the third surface or the fourth surface of the second glazing.
 8. The vacuum glazing of claim 7, wherein the sealant is further disposed on an inner surface of the first glazing and an inner surface of the second glazing, the inner surface of the first glazing facing the inner surface of the second glazing, and wherein the vacuum layer is defined between the inner surface of the first glazing and the inner surface of the second glazing.
 9. The vacuum glazing of claim 7, wherein the second surface defines a side surface of the first glazing, and the fourth surface defines a side surface of the second glazing, and wherein the sealant is further disposed on the side surface of the first glazing and the side surface of the second glazing.
 10. The vacuum glazing of claim 5, wherein at least a portion of the vacuum layer includes a vacant space without the sealant.
 11. A vacuum glazing comprising: a first glazing that has a first surface and a second surface, the second surface extending in a different direction from the first surface; a second glazing that is spaced apart from the first glazing, the second glazing having a third surface and a fourth surface, the fourth surface extending in a different direction from the third surface; a vacuum layer defined between the first glazing and the second glazing; a spacer located in the vacuum layer and configured to support the first glazing and the second glazing; a frame that is located at edge portions of the first glazing and the second glazing; and a sealant that is provided between the frame and at least one surface of the first glazing and between the frame and at least one surface of the second glazing, the sealant being configured to seal the vacuum layer, wherein the sealant includes a first portion provided between the frame and the first surface and a second portion that extends toward an outside of the frame from the first portion, and wherein the second portion is exposed to an outside of the vacuum glazing.
 12. The vacuum glazing of claim 11, wherein the first portion extends along the frame and the second portion contacts an end of the frame.
 13. The vacuum glazing of claim 11, wherein the first glazing, the second glazing, the frame, and the sealant define a side surface of the vacuum glazing.
 14. A vacuum glazing comprising: a first glazing that has a first surface and a second surface, the second surface extending in a different direction from the first surface; a second glazing that is spaced apart from the first glazing, the second glazing having a third surface and a fourth surface, the fourth surface extending in a different direction from the third surface; a vacuum layer defined between the first glazing and the second glazing; a spacer located in the vacuum layer and configured to support the first glazing and the second glazing; a frame that is located at edge portions of the first glazing and the second glazing; and a sealant that is provided between the frame and at least one surface of the first glazing and between the frame and at least one surface of the second glazing, the sealant being configured to seal the vacuum layer, wherein the sealant surrounds at least one of a first corner between the first surface and the second surface of the first glazing or a second corner between the third surface and the fourth surface of the second glazing, wherein the sealant includes a first sealant that contacts the first surface of the first glazing and a second sealant that contacts the second surface of the first glazing, and wherein a first length of the first sealant in a direction of the first surface is greater than a second length of the second sealant in a direction of the second surface.
 15. The vacuum glazing of claim 14, wherein the frame comprises a first part facing the first surface of the first glazing, a second part facing the second surface of the first glazing, a third part facing the third surface of the second glazing, and a fourth part facing the fourth surface of the second glazing, and wherein the sealant surrounds at least one of a first inner corner between the first part and the second part of the frame or a second inner corner between the third part and the fourth part of the frame.
 16. The vacuum glazing of claim 14, wherein the frame comprises a first portion facing the first glazing, a second portion facing the second glazing, and a third portion that connects the first portion to the second portion, the third portion having a bent shape or a round shape.
 17. The vacuum glazing of claim 16, wherein the sealant surrounds at least one of a first inner corner between the first portion and the third portion of the frame or a second inner corner between the second portion and the third portion of the frame. 